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Simplifying 3x + (y + 7) = 90 Reorder the terms: 3x + (7 + y) = 90 Remove parenthesis around (7 + y) 3x + 7 + y = 90 Reorder the terms: 7 + 3x + y = 90 Solving 7 + 3x + y = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + 3x + -7 + y = 90 + -7 Reorder the terms: 7 + -7 + 3x + y = 90 + -7 Combine like terms: 7 + -7 = 0 0 + 3x + y = 90 + -7 3x + y = 90 + -7 Combine like terms: 90 + -7 = 83 3x + y = 83 Add '-1y' to each side of the equation. 3x + y + -1y = 83 + -1y Combine like terms: y + -1y = 0 3x + 0 = 83 + -1y 3x = 83 + -1y Divide each side by '3'. x = 27.66666667 + -0.3333333333y Simplifying x = 27.66666667 + -0.3333333333y
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